Audio board SYNC LOST! error

Using the live looping feature, twice yesterday I got the above error and had to “press any key to restart.”
Today I had it in pattern mode and idle for several hours; when I came back to the machine and clicked “run/stop” it rebooted without the “audio board SYNC LOST” error message.
Rob asked that I open a bug for it and attempt to recreate it but I’ve not been able to do so - short of keeping a video camera trained on the unit I’m not sure I could.
At the time, the only I/O I have going on is a mono/TS cable coming out of a mic preamp into input one, and TS cables out of the L/R outputs going into my audio interface.
S2400 is serial no. 714

I’ll update this thread as I get more information.